Loan Slide H41: Esophagus, Trachea & Thyroid

Region C from the low magnification view (H41a01). Here the full field width is 2400 um. If higher magnification views of labeled regions are available, they may be accessed by clicking on the letter-label. The thyroid is an endocrine gland (no ducts), in which the secretory epithelial cells (parenchyma) are arranged into spherical shells, called follicles. The numerous round/oval pinkish structures shown here are follicles; the variation in size reflects the facts that not all follicles are of the same size and any random section will slice through the follicles at different planes relative to their widest diameter. The epithelial cells form a thin shell around a central space that becomes filled with thyroglobulin, also called colloid. Thyroglobulin is a glycoprotein, secreted by the follicular epithelium, that serves as a storage form of the active thyroid secretion thyroxin.Click here for a higher magnification view of the region labeled "A".

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Last modified: Thursday, May 24, 2001